Incandescent lamp.



A. S. KNIGHT.

INCANDESCENT LAMP.

APPLICATION FILED MAY,13,1909.

1,204,456. Patented Nov 14, 1916.

WITNESSES: INVENTOR g 702% i BY @dw 'h ATTORNEY suave xivii'je ir; or NEWARK, NEW JERSEY, ass'ienon to; weswmeneese Lillian To all whom it may concern lamps, and particularly to supporting means for the filaments thereof.

The object of the invention is to provide simple and economical means 'for resiliently supporting lamp filaments in such manner that they may withstand severe shocks and vibrations without breakage, and which will permit of such expansion and contraction of filaments as may result from heating and 1 cooling thereof and such contraction as may result from aging, without subjecting them to undue strains.

By reason of the crystalline. and brittle character-of certain forms of metallic tungsten and of the more ductile forms of tung sten after being repeatedly brought to incandescence, filaments that are manufactured from tungsten for use' in incandescent lamps are, or may become, extremely fragile.

It is accordingly necessary to very carefully mount them in the lamps in order that they may withstand ordinarv. shocks and vibrations and change in length upon heating,

cooling and aging without subjection to undue strains and breakage.

In order to limit the vibrations of filaments, they are usually supported at frequent intervals by resilient supports which are so constructed and disposed as to sub- .ject the filaments to slight degrees of ten-' verse'ly bent at three points into substan sion in order to maintain them taut under all conditions. Tothis end, it has heretofore been customarv to attach a-rbors to the stems ofthe'lamps, which carry one or more resilient supports for the filaments. The, arbors, being composed of glass, are not only fragile and expensive, but the mounting thereof involves a special manufacturing operation. In the present-case, 'arbors are dispensed with, and the resilient sup orting means for the filament is carried by the stem and is mounted upon substantially 'the same. portion thereof as the terminal wires that project into the lamp. i

My invention is {illustrated in the acc m irectly omi anv', A co'aronn'rron or rnnitsynvnnrn, S

'mcennnscnnr LAMP.

Specification of Letters 1 mm. Pa te -r Na l a, 191 6. "imgn t'ionmei Ma 13,1909. Serial in. 495,789. I M

panying drawings, Figure 1 of which is a side viewof a lamp constructed in accordance therewith and Fig. 2 is a similar view of a modified form of the lamp.

Projecting in the usual manner into the bulb 1- of the lamp, is a stem 2 through which extend terminal wires or'leads 3 and 4:

the inner ends of which are bent abruptly back upon themselves to form V-shaped hooks which are. adapted to engage and clamp, by a wedging action, the hooked extremities of a U-shaped filament 5.

Secured in the flattened end portion of the stem 2, between the leads 3 and 4, is a resilient member 6, the main portion of which projects alongside the filament at a small angle with the axis of the stem-2 and the arbor that has usually been attached to the end of the stem and of the substitution therefor of a substantial, though resilient, supporting member for the bight portion of the filament, the lamp is rendered more economical to manufacture and more durable, when completed, than others of a similar character that have been. heretofore 'constructed.

In the'lam'p of Fig.2, a filament 9 is retially a 'W-shape, and its ends are secured to leads 10 and 11 that project'from the stem 12 intothe lamp in the same manner as in thelamp of Fig. 1. Projecting from the stem 12, and at a slight angle to the plane i of the flattened end portion thereof, are two resilient supporting members 13 and 14, hatingtheir ends bent toward the filament and attached to the adjacent bights thereof, as,

in Fig. 1. The filament is supported at the remaining bight by means of a shorter member that also projects from the stem 12, a link 15 being preferably interposed between the tar n-W1 th fi me tb? n e with special'reference to filaments composed of, or containing, tungsten, it is not restricted in its application to use in connection therewith, but may be applied wherever found useful.

I claim as my invention:

1. An incandescent lamp comprising a stem, conducting leads extending therethrough into the lamp, a reversely bent filament having its ends secured to the conducting leads, and a resilient member projecting from substantially the same portion of the stem asthe conducting leads, the said member supporting the filament at the bight thereof and subjecting its legs to tension.

2. An incandescent lamp comprising a stem, conducting leads extending therethrough into the lamp, a reversely bent filament having its ends secured to the conducting leads, and alternately long and short members mounted upon the stem between the conducting leads and supporting the filament at thebights thereof.

3. An incandescent lamp comprising a stem, conducting leads extending therethrough into the lamp, a reversely bent filament having its ends secured to the conducting leads, and alternately long and short members mounted upon the stem between the conducting leads and supporting the filament at the bights thereof, the long members being resilient.

4. An incandescent lamp comprising a stem, conducting leads extending therethrough into the lamp, a reversely bent filament having its ends secured to the conducting leads, and alternately long and short members projecting from the stem adjacent the conducting leads and supporting the filament at the bights thereof.

5. An incandescent lamp comprising a stem, conducting leads extending therethrough into the lamp, areversely bent filament having its ends secured to the conducting leads, and alternately long and short members projecting from the stem adjacent to the conducting leads and supporting the filament at eac'hof its bights.

6. An incandescent lamp comprising a stem having a flattened ortion, leading-in wires projecting therethrough into the lamp, agreversely bent filament extending between, and having its ends secured to, the leadingin wires, and a vresilient member mounted at one end in the flattened portion of the stem and supporting the bight of the filament ports secured to said stem and attached to the terminals of said filament, and a bent resilient filament holder having a length equal to or greater than the longltudinal axis of the loop and anchored at one end to said carrier adjacent to said supports and engaging at its other end the bight of the filament, said holderbeing resilient throughout its length.

9. A filament mount comprising a carrier, a filament comprising an elongated loop, means for supporting the legs of said filament farthest from its bend, and a bent resilient filament holder of a length approxi mately the length of a-leg of said loop and in engagement at one end with the bight of said loop and anchored at the other'end to said carrier near said supporting means to extend longitudinally of said loop.

10. In an incandescent lamp, a filament loop, a stem, a bent resilient filament holder for said loop of approximately the same length as said loop and anchored near one end to said stem with the other end in engagement with the bight of the filament loop,- said holder being resilient throughout its length and yieldable transversely in all directions under stresses exerted by the filament.

11. A- filament mount comprising a carrier, a filament comprising an elongated loop, means for supporting the legs of said filament farthest from its bend, and a filament holder having a substantially straight portion mounted on said carrier, and a curved portion projecting beyond the bend of said filament and engaging therewith, said holder being resilient throughout its length and being yieldable in all directions under stresses exerted by the filament.

. In testimony whereof, I have hereunto subscribed my name this 30th day of April,

ARTHUR S. KNIGHT. Witnesses H. D. MADDEN, J. F. Donovan.

III) 

